Kellenberger, Roman T.;
Byers, Kelsey J. R. P.;
De Brito Francisco, Rita M.;
Staedler, Yannick M.;
LaFountain, Amy M.;
Schönenberger, Jürg;
Schiestl, Florian P.;
Schlüter, Philipp M.
Emergence of a floral colour polymorphism by pollinator-mediated overdominance
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Medientyp:
E-Artikel
Titel:
Emergence of a floral colour polymorphism by pollinator-mediated overdominance
Beteiligte:
Kellenberger, Roman T.;
Byers, Kelsey J. R. P.;
De Brito Francisco, Rita M.;
Staedler, Yannick M.;
LaFountain, Amy M.;
Schönenberger, Jürg;
Schiestl, Florian P.;
Schlüter, Philipp M.
Erschienen:
Springer Science and Business Media LLC, 2019
Erschienen in:Nature Communications
Sprache:
Englisch
DOI:
10.1038/s41467-018-07936-x
ISSN:
2041-1723
Entstehung:
Anmerkungen:
Beschreibung:
<jats:title>Abstract</jats:title><jats:p>Maintenance of polymorphism by overdominance (heterozygote advantage) is a fundamental concept in evolutionary biology. In most examples known in nature, overdominance is a result of homozygotes suffering from deleterious effects. Here we show that overdominance maintains a non-deleterious polymorphism with black, red and white floral morphs in the Alpine orchid <jats:italic>Gymnadenia rhellicani</jats:italic>. Phenotypic, metabolomic and transcriptomic analyses reveal that the morphs differ solely in cyanidin pigments, which are linked to differential expression of an <jats:italic>anthocyanidin synthase</jats:italic> (<jats:italic>ANS</jats:italic>) gene. This expression difference is caused by a premature stop codon in an <jats:italic>ANS-</jats:italic>regulating <jats:italic>R2R3-MYB</jats:italic> transcription factor, which is heterozygous in the red colour morph. Furthermore, field observations show that bee and fly pollinators have opposite colour preferences; this results in higher fitness (seed set) of the heterozygous morph without deleterious effects in either homozygous morph. Together, these findings demonstrate that genuine overdominance exists in nature.</jats:p>